2.8 Build "Rock, Paper, Scissors"


#1



Oops, try again. Make sure to call your compare function with userChoice and computerChoice as the arguments!


var userChoice = prompt("Do you choose rock, paper or scissors?");
var computerChoice = Math.random();
if (computerChoice < 0.34) {
	computerChoice = "rock";
} else if(computerChoice <= 0.67) {
	computerChoice = "paper";
} else {
	computerChoice = "scissors";
} console.log("Computer: " + computerChoice);

var compare = function(userChoice, computerChoice)
{
    if (userChoice === computerChoice) {
        return "The result is a tie!"
    }
    else if (userChoice === "rock") {
        if (computerChoice === "scissors") { 
        return "rock wins"
    } else {
        return "paper wins"
    }
    }
    
    else if (userChoice === "paper") {
        if (computerChoice === "rock") {  
        return "paper wins"
    } else {
        return "scissors wins"
    }
    }
    
    else if (userChoice === "scissors") {
        if (computerChoice === "paper") {
            return "scissors wins"
        } else { 
            return "rock wins"
        }
    }
}
compare();


#2

At the end of your code, you need to call your function with the two arguments as userChoice and computerChoice, like so

compare(userChoice, computerChoice)

I see that you have passed userChoice and computerChoice into the function itself. This isn't required as when you're making a function, you can pass in arbitrary names. The names really matter when you are using the function, by calling the function. Hope this clears out any doubts you had...


#3

@bengio777,

the FUNCTION talk

var myFunc = function( param1, param2) {
       //Begin of  anonymous FUNCTION-BODY
       //VARIABLE -myFunc- has an -anonymous function- assigned
       //this -anonymous function- has 2 PARAMETERS param1 and param2
       //param1 and param2 PARAMETERS are used 
       //as -local- VARIABLES throughout the FUNCTION-BODY

      console.log( param1 + " and " + param2 ) ;

      //End of anonymous FUNCTION-BODY
};

If you want to call/execute the anonymous function
you will have to add a pair of parentheses to the variable myFunc
like
myFunc();
As the anonymous function was defined
as having 2 parameters
you have to provide 2 arguments
in our case 2 string VALUES "Alena" and "Lauren"
like
myFunc("Alena","Lauren");

some quotes from the outer-world:

**argument is the value/variable/reference being passed in,
parameter is the receiving variable used within the function/block**

OR

**"parameters" are called "formal parameters",
while "arguments" are called "actual parameters".**

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

function with 1 parameter using return-statement

var myFunction = function( param1 ) {
       //Begin of FUNCTION-BODY
       //myFunction =function= has 1 PARAMETER param1
       //this param1 PARAMETER is used as a -local- VARIABLE
       //throughout the FUNCTION-BODY

      return param1;

      //End of FUNCTION-BODY
      };

you have defined a myFunction function
which takes 1 parameter param1
this param1 parameter is used
as a variable throughout the FUNCTION-BODY.

If you want to call/execute this myFunction function
and this myFunction function was defined
as having 1 parameter param1
you will have to provide 1 argument
in our case a "number VALUE" 4
myFunction( 4 );

some quotes from the outer-world:

**argument is the value/variable/reference being passed in,
parameter is the receiving variable used within the function/block**

OR

**"parameters" are called "formal parameters",
while "arguments" are called "actual parameters".**

============================================

As you are using the return-statement in your myFunction function
you will only get a return-value no-display.
You can however capture this return-value in a variable
and then use the console.log()-method to do a display.

var theResult = myFunction( 4 );
console.log( theResult );

OR directly

console.log( myFunction( 4 ) );

#4

This topic was automatically closed 7 days after the last reply. New replies are no longer allowed.